Definition of pelvis in US English:



  • 1The large bony structure near the base of the spine to which the hind limbs or legs are attached in humans and many other vertebrates.

    In humans the pelvis, connected to the base of the spine, forms a basin-shaped hollow frame at the hips, partly supporting the internal organs and providing attachment for the bones and muscles of the legs

    • ‘Nevertheless, it is unusual among vertebrates for the pelvis to play an active role in inspiration.’
    • ‘In addition, the attachment between the pelvis and the vertebral column enlarged to provide additional strength in response to an increase in the amount of force generated by the hind limbs.’
    • ‘About a million people in the UK have the illness, which leads to accelerated bone growth, particularly in the skull, pelvis, spine, thighs and shins.’
    • ‘The two pubic bones are the hub of a network of muscles, tendons and tissues at the base of the pelvis.’
    • ‘It had already metastasized to his spinal column and his bony pelvis, femurs, skull, and tibia.’
    • ‘This forms a joint with the pelvis (hip bone) on either side, called the sacroiliac joint.’
    • ‘It also puts the pelvis and spine into the neutral position and decreases stress on structures such as the intervertebral discs and nerve roots along the spine.’
    • ‘But they feel for the upper part of their pelvis, the bony part, and the lower part of the rib cage, and that's the space in which they're measuring.’
    • ‘Since the two iliac bones are bound strongly together at the centre front, the bony pelvis (sacrum and iliac bones) can only be tilted as a whole by movement at the hip joints and by bending the spine.’
    • ‘In the case of your son's groin strain, your osteopath would be checking your son's sacro-iliac joints, his lumbar spine and all the muscles that attach to his pelvis.’
    • ‘Maintain this relationship between your pelvis and spine throughout each exercise.’
    • ‘The remains include a complete tibia and shoulder blade, as well as parts of a femur, ribs, vertebrae, collarbone and pelvis, as well as an ankle bone.’
    • ‘A computed tomographic scan showed several osteoblastic and osteolytic lesions in vertebral bodies and the pelvis, compatible with metastases.’
    • ‘While in radiology, a computed tomographic scan-guided needle biopsy of a tumor nodule in the bony pelvis was conducted.’
    • ‘Key to skeletal balance, a sense of orientation and muscular coordination, the balanced pelvis forms a rim-like base for the spinal vertebrae, rib cage, shoulder girdle and head.’
    • ‘Laterally, anteriorly and posteriorly the pelvis is bony and significant support is provided through ligaments.’
    • ‘He lived only ten weeks after his diagnosis, the disease having already metastasized to his spine and bony pelvis, femur, skull, and tibia.’
    • ‘The bullet lodged near his pelvis and cannot be safely removed.’
    • ‘The research is based on a dinosaur pelvis that contains a single pair of shelled eggs inside the body cavity.’
    • ‘She says that the relationship of the pelvis to the spine and the limbs is fundamental to most contemporary dance techniques.’
    1. 1.1 The part of the abdomen including or enclosed by the pelvis.
      • ‘A computed tomography of the chest, abdomen, and pelvis did not show any tumor masses or lymphadenopathy.’
      • ‘This misplaced tissue may be found on the ovaries, uterus, bowel, pelvis and abdomen.’
      • ‘The car has seven airbags, which include side curtain airbags and a large new side airbag for the front seats that protects the torso, abdomen and pelvis.’
      • ‘Although you should generally avoid X-rays during pregnancy, a lead apron that covers your pelvis and abdomen can shield your unborn baby.’
      • ‘No other abnormalities were seen in the pelvis, abdomen, or chest cavity.’
      • ‘In July 2001, repeat computed tomographic scans of the neck, chest, abdomen, and pelvis were unchanged.’
      • ‘A computed tomographic scan of the abdomen and the pelvis showed subtle lymph node enlargement in the retroperitoneum.’
      • ‘Computed tomographic scans of the chest, abdomen, and pelvis revealed hepatosplenomegaly and several small retroperitoneal lymph nodes.’
      • ‘Computed tomography scans of the chest, abdomen, and pelvis showed a nodular density in the lung but no other abnormalities.’
      • ‘Often women have an ultrasound examination of the pelvis and abdomen primarily to exclude gynaecological or pelvic pathology.’
      • ‘Rectal examination is essential if the medical history suggests a disorder in the lower abdomen, pelvis, lower rectal or anal region.’
      • ‘After receipt of the pathology report, computed tomograms of the chest, abdomen, and pelvis showed no other lesions or evidence of metastatic disease.’
      • ‘Laparoscopy uses small incisions and telescope like instruments are used to view the pelvis and abdomen.’
      • ‘In the hours following treatment, your child may experience gastrointestinal upset if he or she received radiation treatment to the pelvis or abdomen.’
      • ‘One month postoperatively, however, a computed tomograhic scan of the chest, abdomen, and pelvis demonstrated a new pelvic mass.’
      • ‘Radiographic studies, including computed tomographic scans of the chest, abdomen, and pelvis, were consistent with acute appendicitis.’
      • ‘The results of a computed tomography of the chest, abdomen, and pelvis performed after surgery as well as the results of a bone marrow biopsy were negative.’
      • ‘The nerves to the legs come from the spinal nerve roots that form the lumbar plexus and the sacral plexus, and which lie deep against the back of the abdomen and the pelvis.’
      • ‘Several surgical procedures of the head, neck, chest, abdomen, pelvis, back, and limbs are described.’
      • ‘They are usually found in groups in different places throughout the body, including the neck, armpit, chest, abdomen, pelvis, and groin.’
  • 2The broadened top part of the ureter into which the kidney tubules drain.

    • ‘The renal pelvis, calyces, and renal vein were grossly uninvolved.’
    • ‘A fracture of the pelvis may tear the urethra and/or rupture the bladder.’
    • ‘Reflux that extends into the renal pelvis and calyces and is associated with moderate ureteral, renal pelvic, and calyceal dilation.’
    • ‘As the stone drops from the renal pelvis, down the ureter to the ureterovesical junction, most patients have dysuria, and urinary urgency and frequency.’
    • ‘An atypical hydronephrotic type may have isolated ureteral atresia with multiple cysts communicating with a dilated renal pelvis with dysplastic renal tissue forming trabeculae between the cysts.’
    • ‘This protocol applies to carcinomas of the urinary bladder, ureter, and renal pelvis.’
    • ‘The renal vein, renal pelvis, and ureter were free of tumor.’
    • ‘An intravenous urogram revealed a filling defect in the right renal pelvis, and cystoscopy showed blood emerging from the right ureteric orifice only.’
    • ‘No changes were found in the renal pelvis, ureter, and urinary bladder samples.’
    • ‘The filtered material passes to the kidney pelvis, which connects to the ureter.’
    • ‘Abdominal magnetic resonance imaging and computed tomography identified a large mass in the left kidney and numerous obstructing blood clots in the left renal pelvis, left ureter, and urinary bladder.’
    • ‘The urine passes as droplets from tiny pores in the papillae into the renal pelvis and finally the ureter, which carries it to the urinary bladder.’
    • ‘The etiologic workup, which was composed of an abdominal ultrasonographic examination and a computed tomography study, showed a cystic mass posterior to the uterus with a secondary dilatation of the renal pelvis and ureter.’
    • ‘Tumor infiltration of the renal pelvis and renal parenchyma was noted, along with extension through the renal capsule into the renal sinus and invasion into the main renal vein.’
    • ‘Neither the hilar structures nor the renal pelvis were involved.’
    • ‘Filtrate, at this point identical to urine, passes through the renal pelvis and into the ureter to the bladder where it is excreted.’
    • ‘On the posterior abdominal wall, the left renal pelvis and kidney are seen.’
    • ‘The most common site of an ectopic kidney is in the pelvis, rarely it can be too high and in the chest - a thoracic kidney.’
    • ‘The nephrectomy specimen revealed a dilated renal pelvis and ureter.’
    • ‘In our cases, both neoplasms were located in the lamina propria of the renal pelvis, lifting and denuding the urothelium.’


Early 17th century: from Latin, literally ‘basin’.